Can I get the CSS counter value of the parent?

Question

I need to implement the following list style:

01 Item 1
02 Item 2
    02a Item 2a
    02b Item 2b
03 Item 3

How can I get the counter value of the parent t

Answer 1

See this: there is no way to do such things in CSS, obviously you would need to use JavaScript for it but pseudo-elements are not in the DOM afaik. As for the other answers: he wants the value of the counter that appears before the list items.